Controlled synthesis and functionalization of PEGylated methacrylates bearing cyclic carbonate pendant groups

2010 ◽  
Vol 48 (7) ◽  
pp. 1622-1632 ◽  
Author(s):  
Satyasankar Jana ◽  
Han Yu ◽  
Anbanandam Parthiban ◽  
Christina L.L. Chai
Keyword(s):  
Cyclic Carbonate ◽  
Controlled Synthesis

scholarly journals Controlled synthesis of polyepichlorohydrin with pendant cyclic carbonate functions for isocyanate-free polyurethane networks

2011 ◽  
Vol 49 (12) ◽  
pp. 2677-2684 ◽  
Author(s):  
Anne-Laure Brocas ◽  
Gabriel Cendejas ◽  
Sylvain Caillol ◽  
Alain Deffieux ◽  
Stephane Carlotti
Keyword(s):  
Cyclic Carbonate ◽  
Controlled Synthesis ◽  
Polyurethane Networks

Seeded Growth of Single-Crystal Two-Dimensional Covalent Organic Frameworks

2017 ◽  
Author(s):  
Austin M. Evans ◽  
Lucas R. Parent ◽  
Nathan C. Flanders ◽  
Ryan P. Bisbey ◽  
Edon Vitaku ◽  
...  
Keyword(s):  
Molecular Transport ◽  
Controlled Synthesis ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Seeded Growth ◽  
Covalent Bonds ◽  
Crystalline Materials ◽  
Step Procedure ◽  
Structures And Properties ◽  
2D Polymer

<div> <div> <div> <p>Polymerizing monomers into periodic two-dimensional (2D) networks provides structurally precise, atomically thin macromolecular sheets linked by robust, covalent bonds. These materials exhibit desirable mechanical, optoelectrotronic, and molecular transport properties derived from their designed structure and permanent porosity. 2D covalent organic frameworks (COFs) offer broad monomer scope, but are generally isolated as polycrystalline, insoluble powders with limited processability. Here we overcome this limitation by controlling 2D COF formation using a two- step procedure. In the first step, 2D COF nanoparticle seeds are prepared with approximate diameters of 30 nm. Next, monomers are slowly added to suppress new nucleation while promoting epitaxial growth on the existing seeds to sizes of several microns. The resulting COF nanoparticles are of exceptional and unprecedented quality, isolated as single crystalline materials with micron-scale domain sizes. These findings advance the controlled synthesis of 2D layered COFs and will enable a broad exploration of synthetic 2D polymer structures and properties. </p> </div> </div> </div>

Seeded Growth of Single-Crystal Two-Dimensional Covalent Organic Frameworks

2017 ◽  
Author(s):  
Austin M. Evans ◽  
Lucas R. Parent ◽  
Nathan C. Flanders ◽  
Ryan P. Bisbey ◽  
Edon Vitaku ◽  
...  
Keyword(s):  
Molecular Transport ◽  
Controlled Synthesis ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Seeded Growth ◽  
Covalent Bonds ◽  
Crystalline Materials ◽  
Step Procedure ◽  
Structures And Properties ◽  
2D Polymer

<div> <div> <div> <p>Polymerizing monomers into periodic two-dimensional (2D) networks provides structurally precise, atomically thin macromolecular sheets linked by robust, covalent bonds. These materials exhibit desirable mechanical, optoelectrotronic, and molecular transport properties derived from their designed structure and permanent porosity. 2D covalent organic frameworks (COFs) offer broad monomer scope, but are generally isolated as polycrystalline, insoluble powders with limited processability. Here we overcome this limitation by controlling 2D COF formation using a two- step procedure. In the first step, 2D COF nanoparticle seeds are prepared with approximate diameters of 30 nm. Next, monomers are slowly added to suppress new nucleation while promoting epitaxial growth on the existing seeds to sizes of several microns. The resulting COF nanoparticles are of exceptional and unprecedented quality, isolated as single crystalline materials with micron-scale domain sizes. These findings advance the controlled synthesis of 2D layered COFs and will enable a broad exploration of synthetic 2D polymer structures and properties. </p> </div> </div> </div>

CONTROLLED SYNTHESIS OF THIN FILMS OBTAINED BY MAGNETRON SPUTTERING TECHNIQUE

2018 ◽  
Author(s):  
K. E. Utkin ◽  
◽  
S. I. Torgashin ◽  
A. V. Khoshev ◽  
◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Controlled Synthesis

Sustainable Solid Catalysts for Cyclic Carbonate Synthesis from CO2 and Epoxide

2015 ◽  
Vol 19 (8) ◽  
pp. 681-694 ◽  
Author(s):  
Xian-Dong Lang ◽  
Xiao-Fang Liu ◽  
Liang-Nian He
Keyword(s):  
Cyclic Carbonate ◽  
Solid Catalysts

Participation of 19-ester groups in the cleavage of 2α,3α- and 5α,6α-steroid epoxides. A case of competition between participation and external nucleophile attack

1979 ◽  
Vol 44 (5) ◽  
pp. 1496-1509 ◽  
Author(s):  
Pavel Kočovský ◽  
Václav Černý
Keyword(s):  
Perchloric Acid ◽  
Hydrobromic Acid ◽  
Ester Group ◽  
Carbonyl Oxygen ◽  
Cyclic Carbonate ◽  
Cyclic Ether ◽  
Normal Reaction ◽  
Neighboring Group ◽  
Ether Oxygen ◽  
The Difference

Acid cleavage of the acetoxy epoxide IIIa with aqueous perchloric acid or hydrobromic acid gave two types of products, i.e. the diol Va or the bromohydrin VIa, and the cyclic ether VIII. The latter compound arises by participation of ether oxygen of the ester group. On reaction with perchloric acid the epoxide IVa gave the diol XIIIa as a product of a normal reaction and the isomeric diol Xa as a product arising by intramolecular participation of the carbonyl oxygen of the 19-acetoxy group. Participation of the 19-ester group is confirmed by the formation of the cyclic carbonate XI when the 19-carbonate IVb is treated analogously. On reaction with hydrobromic acid, the epoxide IVa gave solely the bromohydrin XIVa as a product of the normal reaction course. Discussed is the similarity of these reactions with electrophilic additions to the related 19-acetoxy olefins I and II, the mechanism, the difference in behavior of both epoxides III and IV, the dependence of the product ratio on the nucleophility of the attacking species, and the competition between participation of an ambident neighboring group and an external nucleophile attack.

One-step controlled synthesis of anisotropic gold nanostructures with aniline as the reductant in aqueous solution

2007 ◽  
Vol 309 (2) ◽  
pp. 518-523 ◽  
Author(s):  
Zhirui Guo ◽  
Yu Zhang ◽  
Lan Huang ◽  
Meng Wang ◽  
Jing Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Gold Nanostructures ◽  
Controlled Synthesis ◽  
One Step

Structural-controlled synthesis of polyaniline nanoarchitectures using hydrothermal method

2014 ◽  
Vol 27 (2) ◽  
pp. 207-216 ◽  
Author(s):  
Xuyang Zhu ◽  
Kun Hou ◽  
Chun Chen ◽  
Weiqiang Zhang ◽  
Huaming Sun ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Controlled Synthesis
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